Deutsche Bank has downgraded Dollar General Corp. to Hold from Buy on valuation."Our new price target of $99 (up from $95) is based on 19.0x (vs. 18.0x prior) our FY17 EPS estimate of $5.20 (down from $5.25 due to lower margin assumptions), which no longer equates to a Buy," analyst Paul Trussell wrote in a note.That said, Trussell is positive on the fundamentals of Dollar General as he expects the company can sustain about 2–3 percent comp growth as the low-end consumer "appears in relatively fair shape."The analyst also highlighted the company's accelerating square footage growth, upside opportunity on margins, sustainable positive SSS, and strong cash flow.However, despite seeing strong execution to continue, the analyst said he tempered his expectations related to margin gains ahead.Full ratings data available on Benzinga Pro.